Actuator for brake device

Abstract

The actuator includes a housing configured to have not only a motor accommodation part, but also a gear mounting part to which a deceleration gear unit is mounted. The gear mounting part includes not only a shaft hole formed to be penetrated at a center part of a top surface of the gear mounting part, but also a ring gear part formed along in an inner circumference of the gear mounting part. The deceleration gear unit includes a worm wheel configured to have a sun gear that is rotatably supported by an outer surface of the gear mounting part and is inserted into the gear mounting part through the shaft hole, a plurality of planetary gears engaged with the sun gear and the ring gear part within the gear mounting part, and a carrier coupled to the plurality of planetary gears to be rotatable, and provided with an output shaft.

What is claimed is: 
     
       1. An actuator for a brake device comprising:
 a housing configured to have not only a motor accommodation part accommodating a motor therein, but also a gear mounting part to which a deceleration gear unit is mounted; and 
 a casing coupled to an opened upper part of the housing, 
 wherein the gear mounting part is formed in a hollow cylindrical shape in which an upper part is closed and a lower par is opened, and includes not only a shaft hole formed to be penetrated at a center part of a top surface of the gear mounting part, but also a ring gear part formed along in an inner circumference of the gear mounting part, and 
 wherein the deceleration gear unit includes:
 a worm wheel configured to have a sun gear that is rotatably supported by an outer surface of the gear mounting part and is inserted into the gear mounting part through the shaft hole; 
 a plurality of planetary gears engaged with the sun gear and the ring gear part within the gear mounting part; and 
 a carrier coupled to the plurality of planetary gears to be rotatable, and provided with an output shaft. 
 
 
     
     
       2. The actuator according to  claim 1 , wherein the worm wheel includes:
 a ring part formed to be penetrated at a center part thereof, and configured to have gear teeth formed in an outer circumference thereof; and 
 a cover part coupled to the ring part to cover an opened upper part of the ring part and an inner surface of the ring part. 
 
     
     
       3. The actuator according to  claim 2 , wherein:
 the ring part is formed of a synthetic resin material; and 
 the cover part is formed of steel. 
 
     
     
       4. The actuator according to  claim 1 , further comprising:
 a worm member configured to transmit rotational force of the motor to the worm wheel. 
 
     
     
       5. The actuator according to  claim 4 , wherein the worm member includes:
 a worm shaft provided with a gear part engaged with the worm wheel at an outer circumference thereof; and 
 a bearing and a driven worm wheel respectively coupled to both ends of the worm shaft, 
 wherein the motor includes a rotary shaft coupled to a drive worm engaged with the driven worm wheel. 
 
     
     
       6. The actuator according to  claim 1 , wherein:
 the worm wheel is coupled to an upper part of the gear mounting part in a manner that the gear mounting part is accommodated into the worm wheel; and 
 the carrier is inserted into and coupled to the gear mounting part at a lower part of the gear mounting part. 
 
     
     
       7. The actuator according to  claim 1 , wherein the gear mounting part is detachably coupled to the housing. 
     
     
       8. The actuator according to  claim 7 , wherein:
 the housing includes an extension panel coupled to the gear mounting part, 
 wherein a hook is detachably coupled to the extension panel at a lower end of the gear mounting part. 
 
     
     
       9. The actuator according to  claim 8 , wherein the extension panel includes:
 a plurality of stopper ribs spaced apart from each other by a predetermined distance in a circumferential direction; and 
 at least one coupling rib engaged with the plurality of stopper ribs at the lower end of the gear mounting part. 
 
     
     
       10. The actuator according to  claim 1 , further comprising:
 a damper member configured to support a lower end of the motor at a bottom surface of the motor accommodation part. 
 
     
     
       11. The actuator according to  claim 1 , wherein the worm wheel is provided to cover a top surface and a side surface of the gear mounting part. 
     
     
       12. The actuator according to  claim 1 , wherein the worm wheel includes an accommodation space therein,
 wherein the accommodation space is configured to accommodate the gear mounting part so as to surround the gear mounting part. 
 
     
     
       13. The actuator according to  claim 1 , further comprising:
 a carrier shaft part configured to penetrate a shaft hole of the sun gear at a center part of the carrier such that the carrier shaft part is rotatably supported by the casing.